1. Arthropod segments have also fused together into functional units called tagma

2. Chelicerates' bodies consist of two tagmata, sets of segments that serve similar functions: the foremost one, called the prosoma or cephalothorax, and the rear tagma is called the opisthosoma or abdomen

3. In all other cases in which trilobite Biramous appendages have been reported variations among serial Biramous appendages are generally viewed to be minor and unworthy of designation as distinct tagma

4. Tagma: a specialized grouping of Arthropodan segments, such as the head, the thorax, and the abdomen with a common function; malpighian tubule: a tubule that extends from the alimentary canal to the exterior of the organism, excreting water and wastes in the form of solid nitrogenous compounds

5. Like many insect body parts, including mandibles, antennae and stylets, cerci are thought to have evolved from what were legs on the primal insect form; a creature that may have resembled a velvet worm, Symphylan or a centipede, worm-like with one pair of limbs for each segment behind the head or anterior tagma.